#include <stdio.h>
#include <math.h>
int main(int argc , const char *argv[])
{
    double x = 5,y = 3;
    double ret;
    ret = pow(x,y);
    printf("ret = %lf\n",ret);
    ret = sqrt(25);
     printf("ret = %lf\n",ret);

//编译时加上数学库  格式gcc 源文件.c -lm
       return 0;
}